public Expression BuildExpression(ExpressionBuilderArgs args)
{
var members = GetMembers();
var resultObjectVar = args.InstanceVar;
var innerArgs = args.Clone();
if (_endianness.HasValue)
{
innerArgs.Endianness = Expression.Constant(_endianness.Value, typeof(Endianness));
}
var instanceVar = Expression.Parameter(typeof(T), "result");
var expressions = new List <Expression>();
expressions.Add(Expression.Call(typeof(Debug), "Indent", null));
expressions.Add(Expression.Assign(instanceVar, Expression.Convert(resultObjectVar, typeof(T))));
if (typeof(T).IsClass())
{
expressions.Add(Expression.IfThen(Expression.Equal(instanceVar, Expression.Constant(null)),
Expression.Throw(Expression.New(typeof(ArgumentNullException).GetConstructor(new[] { typeof(String) }),
Expression.Constant(instanceVar.Name, typeof(String))))));
}
innerArgs.InstanceVar = instanceVar;
expressions.AddRange(members
// filter ignored members
.Where(pair => pair.Value != null)
.Select(pair =>
{
var expression = pair.Value.BuildExpression(innerArgs);
return((Expression)Expression.Assign(
Expression.PropertyOrField(instanceVar, pair.Value.MemberName),
expression));
}));
expressions.Add(Expression.Call(typeof(Debug), "Unindent", null));
return(Expression.Block(new[] { instanceVar }, expressions));
}
protected override Expression BuildBodyExpression(ExpressionBuilderArgs args, ParameterExpression innerResultVar, ParameterExpression typeVar)
{
var elementType = typeof(TElement);
//IExpressionBuilder typeBuilder = FileFormatBuilder.Types[elementType];
var iVar = Expression.Variable(typeof(int), "i");
var elementVar = Expression.Variable(elementType, "iterator");
var loopEndLabel = Expression.Label();
var elementBuilder = MemberBuilder <TMember, TElement> .Create("[i]");
if (_elementBuilderConfiguration != null)
{
_elementBuilderConfiguration(elementBuilder);
}
var innerArgs = args.Clone();
innerArgs.InstanceVar = innerResultVar;
return(Expression.Block(
new[] { iVar, elementVar },
Expression.Assign(iVar, Expression.Constant(0)),
AdvancedExpression.Debug("Reading collection {0}...", Expression.Constant(MemberName)),
Expression.Loop(
Expression.IfThenElse(
GetLoopCondition(args, innerResultVar, iVar, elementVar),
Expression.Block(
AdvancedExpression.Debug("Reading {0}[{1}]...", Expression.Constant(MemberName), iVar),
Expression.Assign(elementVar, elementBuilder.BuildExpression(innerArgs)),
/*
* Expression.Assign(elementVar, elementCtor),
* typeBuilder.BuildExpression(brParameter, elementVar, typeReaders),
*/
InsertElement(args, innerResultVar, iVar, elementVar),
Expression.PostIncrementAssign(iVar)),
Expression.Break(loopEndLabel)),
loopEndLabel)));
}